Photographic element containing imidazolonoylacentanilide coupler

Abstract

Disclosed is a photographic element comprising a light sensitive silver halide emulsion layer having associated therewith a coupler represented by formula F-1, wherein: R 1 , R 3 and R 5 are independently selected from hydrogen or a substituent group and two of them may join to form a ring; X is hydrogen or a coupling-off group, B is hydrogen or a substituent group; Z is a substituent group, and n varies from 0-4. The element exhibits improved dye-forming activity and an improved combination of dye hue and dye stability.

What is claimed is:  
     
       1. A photographic element comprising a light sensitive silver halide emulsion layer having associated therewith a coupler represented by formula F-1,                    
       wherein: 
       R 1 , R 3  and R 5  are independently selected from hydrogen or a substituent group and two of them may join to form a ring;  
       X is hydrogen or a coupling-off group,  
       B is hydrogen or a substituent group;  
       Z is a substituent group, and n varies from 0-4.  
     
     
       2. The element of  claim 1  wherein R 1  represents a substituent group linked to the coupler by a carbon atom. 
     
     
       3. The element of  claim 2  wherein R 1  and R 5  represent (cyclo)alkyl, aryl, or heterocyclic groups. 
     
     
       4. The element of  claim 1  wherein B is a substituent constituting a Lewis base. 
     
     
       5. The element of  claim 4  wherein B is a halogen substituent or an aryloxy or alkoxy group. 
     
     
       6. The element of  claim 5  wherein B is a chloro substituent. 
     
     
       7. The element of  claim 6  wherein B is an alkoxy group. 
     
     
       8. The element of  claim 1  wherein R 1  is an alkyl group. 
     
     
       9. The element of  claim 1  wherein X is hydrogen, a phenoxy group or a nitrogen linked heterocycle group. 
     
     
       10. The element of  claim 9  wherein X is a phenoxy group. 
     
     
       11. The element of  claim 1  wherein R 5  is an aryl group. 
     
     
       12. The element of  claim 11  wherein R 5  is a phenyl group. 
     
     
       13. The element of  claim 12  wherein B is an alkoxy group and R 5  is a phenyl group. 
     
     
       14. The element of  claim 12  wherein the anilide ring is substituted with a Z substituent having a positive Hammett's sigma para value.